Anders gustav nyblin



7 UNITED STATES PATENT OFFICE.

ANDERS GUSTAVNYBLIN, OF STOOKHOLM, Sl/VEDEN.

DENTAL- FORCEPS.

SPECIFICATION forming part of Letters Patent No. 408,739, dated August 13, 1889.

Application filed October 3, 1388. Serial No. 287,122. (No model.) Patented in gweden October 21, 1387, No. 1,102.

To all whom it may concern.-

Be it known that I, ANDERS GUSTAV NYB- LIN, a subject of the King of Sweden, residing in Stockholm, Sweden, have invented cer= tain Improvements in Dental Forceps, (for which Letters Patent have been granted in Sweden, dated October 21, 1887, No. 1,102,) of which the following is a specification.

Myinvention relates to that class of forceps which are provided with removable beaks or jaws; and the object of my invention is mainly to furnish such a forceps with means for securing the jaw in the socket in the handle, and with means for preventing the jaw from rotating in the handle when set therein.

In the accompanying drawings, illustrative of my invention, Figures 1 and 2 are elevations, taken at right angles to each other, of a forceps with two sockets in each handle and adapted for use on the teeth of both the upper and lower maxillaries. Fig. 3 represents a forceps adapted especially for use on the teeth of the lower jaw, and Fig. 4 is a similar view of a forceps for use on the teeth of the upper jaw. These styles of forceps have each but one set of sockets for the jaws. Figs. 5 and 6 are two views of a forceps for use on the lower jaw when operating from the side, the handles having sockets which extend entirely through the jaw, so that'the jaws may be set into them from either end. Fig. 6 shows the jaws in place. Figs. 7, 8, and 9 are fragmentary plan views, respectively, of one member of the forceps illustrated in Figs. 1, 3, and 5, showing the jaws in place. Fig. 7 is on a somewhat larger scale than the preceding figures. Figs. 10, 11, and 12 are fragmentary views, on the same scale as Fig. 7, illustrating the manner of constructing the spring-retainer for holding the jaw in place in the socket. Figs. 13, 14., 15, 16, and 17 each comprise two views of a removable jaw adapted for use in myforceps and each provided with a cylindrical shank.

The handles of my forceps are constructed in very much the usual way-of two members hinged together, as seen in' the drawings. The removable jaws will also have their edges formed in'very much the usual manner. A

description of these parts will therefore be unnecessary.

The handles of the forceps are provided at spring h under it back of the fulcrum.

their front or operating ends with one or more cylindrical sockets with their axes arranged at right angles with the axes of the handles. The jaws are not integral with, but are separate from the handles. The edges of these jaws are adapted to the shape of the different teeth, and each jaw has a cylindrical shank which fits in the socket in the handle. This shank has a transverse groove or recess a, as seen in Figs. 13 to 17. The claw is secured in the socket in the handle (61/ in Figs. 10 to 12) by a spring-latch 1), Figs. 10 to 12, which is pivotally mounted in the handle and has a The latch has a projecting part which enters the socket a from the side thereof and engages the groove or notch a when the jaw is in place. Figs. 10, 11,- and 12 illustrate three different ways of pivoting the latch and arranging its spring.

In order to prevent the jaw from rotation in its socket, it is provided with a projection c, which registers with a recess or keyway d in-the wall of the socket.

In some cases the projection c on the jaw is made narrower laterally than the keyway d in order that the jaw may turn a little on its axis, the better to adapt itself to the obliquities of the teeth. This construction is illustrated in Fig. 7. The construction where the projection c fits snugly in the keyway is illustrated in Figs. 8 and 9. The cylindrical shank of the jaw has its axis substantially coincident with the axis of the jaw.

Where there are two sockets entering from different sides of the handle, as seen in Figs. 2 and 7 the axes of the sockets may be made to cross each other obliquely and the same spring-latch may be utilized for securing the jaw in either socket, as the notch a in the shank of the jaw, when the shank is in either socket, will be situated at the point where the sockets intersect.

Having thus described my invention, I claim- 1. A dental forceps having in each handle thereof a cylindrical socket to receive the shank of the removable jaw, a spring-latch mounted on the handle, and a jaw the cylindrical shank of which has a recess which is engaged by said spring-latch when said jaw is in place.

which latter have shanks that fit into said sockets, and retainers for said jaws, substantially as set forth.

In witness whereof I have hereunto signed I 5 my name in the presence of two subscribing witnesses.

ANDERS GUSTAV NYBLIN.

Witnesses:

NERE A. ELFWING, ERNST SvANwIsT. 

